Construction of three new metal-organic frameworks with distinct SBUs: trinuclear {Cd-3(COO)(6)} clusters, inorganic -Cd-O-Cd- chains, and heterometallic trinuclear {Cd2Ba(COO)(4)} clusters

摘要

Three metal-organic frameworks (MOFs), [Cd-3(OABDC)(2)(e-urea)(4)](n) (1), [Cd-3(OABDC)(2)(H2O)(5))](n) (2) and [Cd2Ba(OABDC)(2)(H2O)(7)](n) (3) (H(3)OABDC=5-oxyacetate isophthalic acid, e-urea=2-imidazolidinone), were prepared using H(3)OABDC and metal salts. Single-crystal X-ray diffraction analyses reveal that 1 features a 2-D layered structure constructed from trinuclear {Cd-3(COO)(6)} SBUs and represents a (3,6)-connected kgd topology. Compounds 2 and 3 are 3-D inorganic-organic hybrid frameworks; 2 employs infinite inorganic -Cd-O-Cd- chains as SBUs, whereas (3,6)-connected ant-type 3 employs heterometallic trinuclear {Cd2Ba(COO)(4)} clusters as SBUs. The structures of these three compounds indicate that the SBUs play an important role in the construction of MOFs. Moreover, the thermal stabilities and solid-state photoluminescent properties of these three compounds have also been investigated.